Definition of monsterer in English:

monsterer

Pronunciation /ˈmɒnst(ə)rə/

noun

rare
  • A person who ‘monsters’. Originally: †one who exaggerates to a remarkable degree (obsolete). Now: one who criticizes harshly or savagely (Australian, informal).

Origin

Mid 19th century; earliest use found in Catherine Gore (d. 1861), novelist and playwright. From monster + -er.